Combined insulated stem and joint



P. F. coNNoLLY. CoMBIIIlEnI'NsuZLATEn STEM AND JOINT.

' APPLICATION FILED sEPLlIs. '1920.

Patented May 10, 1921 v no.

UNITED STATES PETER r. ooNNoLLY, or CHICAGO, 'ILLINoIsL l COMBINED IE'SULATED STEM AND JOINT;

Specification of LettersrPatent.

Patented May 10, 1921.

VApplication ied'sptember 13,11950. serifnlvo.Y 4o9,774

To all 'whom t may concern.'

Be it known that I, PETER F. CoNNoLLY, a citizen of the United States, residing at Chicago, Cook county, Illinois, have invented certain new and useful Improvements in Combined Insulated Stems and Joints, of which the following, taken in connection with the drawings, is a description.

My invention relates to the insulated stem and joint usedV in connection with electric fixtures and has for its object the production of a combined insulated stem and joint by means of which the wires connected with the source of electricity are carried to the lighting` fixtures.

It is also an object of my invention to provide in the stem means whereby wires may be threaded therein, through the stem without the aid of other tools to engage the wire and draw it through the stem as has heretofore been necessary.

A further object of my invention is to provide an insulating means between the stem and-loop at the end thereof which shall be simple in construction, cheap to manufacture, easy to install, and very effective for the purpose intended.

In the accompanying drawings I have illustrated what I now consider the preferred form of an embodiment of my invention, although I do not desire to be limited to the size, proportion, orminor detailsthereof, which may be changed without departing from the spirit of my invention, and in these drawings liigure l is a vertical, sectional view through the stem and a side elevation `of the nipple, washer and loop, Y Y

Fig. 2 is a vertical, sectional view taken on line 2-2 of Fig. l,

Fig. 3 is a transverse, sectional view taken on line 3-3 of Fig. 2, looking in the direction of the arrow. A

Referring to the drawings A represents a tubular stem which is connected in the usual manner with the knock-out box located in the wall or ceiling of the building. Threaded in this tube near the end thereof is a plug B iitting closely in the inner wall of the stem A. This plug is elongated on one side thereof on a line diagonal to the axis, and has formed therein a channel or groove Z), which terminates at the opening a through the wall of the pipe A.

The electric light wires to be carried to the fixtures are passed through this opening cz, and guided by the channel down through the nipple to the fixture outside, (the fixture referred to herein forming no part of my invention, it is not shown in the drawing, as any lighting fixtures now on the market are suitable for the purpose.)

At the end of the stem opposite the plug B is a loop C, which has formed on one side thereof, as at c, a tubular neck v portion through which extends the opening c, which has open communication with the interior of the stem A. l

A threaded socket D is provided in this neck portion C, the diameter of the socket being larger than the opening c thereby providing a shoulder c2, which forms a seat for the end of the nipple D. The nipple D is exteriorly screw threaded and has engagement with the interior threads in the socket D.

E is a washer formed of insulating material and surrounds the shank' of the nipple D and is positioned between the neck c of the loop C at the end of the tubular stem A.

The washer E is provided with an annular recess E, which receivesthe end of a sleeve or collar E2, which fits inside of the tubular stiemDA and surrounds the'body of the nipp e y The stem A is preferably provided with an inwardly turned flange a2, upon which is seated the shouldera, formed on the collar E2. i

A Harige ci is formed on the end of the nipple D and seats against the insulating sleeve E2. When these parts are assembled as shown in Fig.' 2, a perfectly tight insulated joint is formed between the stem A and the loop C. When the electric wires are introduced into the stem A, through the opening a, the channel Z9 directs them downwardly toward the opening 03, which extends through the nipple D and opening 0'; the

wiring may then be extended as desired; usu' ally with the chains from which the fixture is suspended from the loop C, and they are carried tothe place desired in any well known manner.

I claim l. In an insulating stem and joint, the

combination of a tubular member, a plug secured in one end thereof, said plug having a channel formed therein, the end of which channel terminates at an opening'through the wall 4of the stem. v

2. In an insulating stem and joint, Vthe combination of a tubular member, a plug secured in one end thereof, said plug being elongated on one side thereof on a line diagonal to its aXis and having a channel formed therein, the end of Which is coincident With an opening through the Wall of the stem.

3. A new article of manufacture, comprising in combination a tubular member, a

` plug secured in one end thereof, said plug having a channel formed therein, Which is coincident with an opening through the Wall of the tubular member, a nipple having engagement With the opposite bular member, and means for insulating said nipple from the tubular` member.

ln testimony `whereof l have signed this specification.

PETER F. CONNOLLY.

end of said tu. 

